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United States Patent 1884460
Inventors:
Williams, Joseph H.
Publication Date:
10/25/1932
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Download PDF 1884460
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Assignee:
Williams, Joseph H.
Primary Class:
408/211
Other Classes:
76/115, 409/175, 470/209, 407/113, 408/227
International Classes:
B23C3/05
;
B23C3/00